Darobi, Ichwandanny Fathur (2021) Analisis Respon Struktur Pipeline End Manifold (PLEM) Akibat Proses Settlement. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pipeline end manifold (PLEM) adalah offshore structure yang terdiri dari subsea manifold sederhana yang menggabungkan dua atau lebih pipa menjadi satu saluran pipa. Seperti offshore structure lainnya, terdapat resiko penurunan tanah yang diduga dapat meningkatkan stress member structural frame dan pipeline system PLEM. Stress yang berlebih pada pipa dan member frame dapat berbahaya karena melebihi ketentuan codes yang diperbolehkan. Oleh karena itu diperlukan analisis rasio UC pipa dan member frame saat PLEM mengalami settlement. Analisis stress dilakukan menggunakan metode numerik dengan membuat model pada perangkat lunak berbasis FEM, Autopipe untuk pipa dan SACS untuk frame. Rasio UC pipa mengacu pada ASME B31.8 tahun 2010 dan structural frame mengacu pada API RP 2A (WSD) edisi 22 tahun 2014. Variasi penurunan tanah seabed rata bersatuan mm dan seabed miring bersatuan sudut kemiringan. Dari analisis tersebut settlement yang diperbolehkan codes pipa adalah pada kedalaman dibawah 450,42 mm dan semakin dalam settlement semakan bertambah pula stress pipa. Semakin dalam settlement semakin bertambah pula stress member frame, pada kedalaman 600 mm settlement didapat stress paling besar pada member E04(L) dengan nilai 133,125 N/〖mm〗^2 dengan UC 0,375. Tilt settlement juga berpengaruh pada stress pipa dimana semakin miring tilt settlement semakin besar stress pipa, kemiringan maksimal sesuai codes adalah 2,27˚ pada kemiringan arah selatan. Pengaruh tilt settlement paling besar pada member frame didapat pada arah barat di member E04(U) dengan nilai 244,6 N/〖mm〗^2 dengan UC 0,689, tilt settlement 3˚. Semakin miring tilt settlement semakin besar pula stress pada member frame.
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Pipeline end manifold (PLEM) is an offshore structure that consists of a simple subsea manifold that combines two or more pipelines into one pipeline. Like other offshore structures, the risk of seabed settlement may occur, settlement is predicted can increase the stress of pipe and frame members. stress that exceeds allowable stress of codes may be a danger. so, stress analysis of UC ratio of pipe and frame PLEM due to the settlement must be done. Stress analysis is performed using the numerical method with the model in FEM software, Autopipe for pipe and SACS for frame member. UC ratio refers to AMSE B31.8 2010 for pipe and API RP 2A (WSD) 22ed 2014 for the structural frame. Settlement variations for flat seabed made with mm units and tilt settlement made with tilt degree unit. from the analysis maximum settlement that codes allowed is below 450,42 mm and the deeper settlement means bigger pipe stress occurred. The deeper the settlement, the more stress of member frame increases. At a depth of 600 mm settlement, the biggest stress is found in member E04(L) with a value of 133.125 N/〖mm〗^2 with UC 0.375. Tilt settlement also affects pipe stress where the tilted tilt settlement the bigger pipe stress, the maximum slope according to the codes is 2.27˚ on the southward slope. The biggest effects of tilt settlement on the member frame are found in westward slope at member E04(U) with a value of 244.6 N/〖mm〗^2 with UC 0.689, on 3˚ tilt settlement. the more tilted the tilt settlement, the greater the stress on the member frame.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Uncontrolled Keywords: | Settlement, Tilt Settlement, PLEM, Analisis Stress Pipa, Analisis Stress Structural Frame, Pipe Stress Analysis, structural Frame Stress Analysis |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Ichwandanny Fathurahman Darobi |
| Date Deposited: | 16 Aug 2021 05:59 |
| Last Modified: | 03 Oct 2024 02:09 |
| URI: | http://repository.its.ac.id/id/eprint/86987 |
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